This figure depicts a puzzle with 6 pieces. The following lists the pieces as they appear in the figure:

1. The knowledge and skills of the web designer (e.g., alt tags, captioning, adheres to all WAI guidelines)
2. Authoring Tools (a): Creators of markup language editors (e.g., Front Page, Dreamweaver)
3. Authoring Tools (b): Creators of course software (e.g., Web CT, Black board, Object servers)
4. User Agents (a): Creators of browsers (e.g., Internet Explorer, Netscape, AOL)
5. User Agents (b): Creators of assistive technology (e.g., JAWS, ZoomText)
6. Knowledge and skills of the user (e.g., can use all the features that are available)